android学习笔记20——ProgressDialog进度条对话框

ProgressDialog==>进度条对话框

ProgressDialog本身就代表一个进度条对话框，程序只需要创建ProgressDialog实例，并将其显示出来就是一个进度条对话框；开发者也可以设置进度对话框里进度条的方法。

包含了如下常用方法：

　　1.setIndeterminate(boolean indeterminate):设置对话框里的进度条是否显示进度值；

　　2.setMax(int max):设置对话框里进度条的最大值；

　　3.setMessage(CharSequence message):设置对话框里显示的消息；

　　4.setProgress(int value):设置对话框里进度条的进度值；

　　5.setProgressStyle(int style):设置对话框里进度条的风格；

实例如下：

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布局文件==》
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
 
    <EditText
        android:id="@+id/edtContent"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
 
    <Button
        android:id="@+id/btnexec"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="progressDialog" />
 
</LinearLayout>
 
代码实现==》
package com.example.myprogressdialog1;
 
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
 
public class MainActivity extends Activity
{
    private int[] date = new int[100];
    private int hasDate = 0;
    final int progress_Dialog = 0x112;
    private int progressStatus = 0;
    private ProgressDialog pd;
    private Handler handler;
 
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        Button btnexec = (Button) this.findViewById(R.id.btnexec);
        btnexec.setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                showDialog(progress_Dialog);
            }
        });
        handler = new Handler()
        {
            @Override
            public void handleMessage(Message msg)
            {
                if (msg.what == 0x112)
                {
                    pd.setProgress(progressStatus);
                }
            }
        };
    }
 
    @Override
    protected Dialog onCreateDialog(int id, Bundle args)
    {
        System.out.println("---------------create---------------");
        switch (id)
        {
        case progress_Dialog:
            pd = new ProgressDialog(this);
            pd.setMax(100);
            pd.setTitle("任务完成百分比");
            pd.setMessage("耗时任务完成百分比");
            // 设置对话框取消按钮不可用
            pd.setCancelable(false);
            // 设置对话框进度条样式风格
            pd.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
            // 设置对话框的进度条是否显示进度
            pd.setIndeterminate(true);
            break;
        }
        return pd;
    }
 
    // 该方法将在onCreateDialog()调用之后被回调
    @Override
    protected void onPrepareDialog(int id, Dialog dialog)
    {
        System.out.println("-----------------prepare-----------------");
        super.onPrepareDialog(id, dialog);
        switch (id)
        {
        case progress_Dialog:
            pd.incrementSecondaryProgressBy(-pd.getProgress());
            new Thread()
            {
                public void run()
                {
                    while (progressStatus < 100)
                    {
                        progressStatus = doWork();
                        Message msg = new Message();
                        msg.what = 0x112;
                        handler.sendMessage(msg);
                    }
                    if (progressStatus >= 100)
                    {
                        pd.dismiss();// 关闭对话框
                    }
                }
            }.start();
            break;
        }
    }
 
    private int doWork()
    {
        date[hasDate++] = (int) (Math.random() * 100);
        try
        {
            Thread.sleep(100);
        } catch (InterruptedException e)
        {
            e.printStackTrace();
        }
        return hasDate;
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}